Hi all

I have made a simple ray tracer and all was well until i tried to render a background image for my laptop with a resolution of 1366x768.

When rendering to this aspect ratio of 1.78 my spheres become ovals. In almost every other resolution this doesnt happen. Is there something wrong with my raster space -> camera space code? Or is this some kind of perspective or aspect ratio problem?

Thanks

500x500 - AR = 1

800x400 - AR = 2

800x260 - AR = 3

'

800x450 - AR = 1.78

I notice 3 of these have a nice round integer aspect ratio. The only one that doesn't is also the one that breaks? Maybe you are accidentally storing the aspect ratio as an integer (or passing it as an integer into some function somewhere). So, it just clips the number to 1, renders with a 1:1 aspect ratio, and then you are stretching the image to fit into the 1.78 frame. (right now, the 1.78 render looks an awful lot like a stretched version of the 1:1 render)

Try rendering some other non-integer aspects.... like 2.3 or 1.5 or whatever.

Thanks MissionCtrl

I triple checked all my castings etc. I cant see anything wrong.

800x347 - AR = 2.3

It seems to be just that specific aspect ratio. 16:9

Your 800x347 rendering actually is stretched slightly; you need to look a little carefully

Agreed. This looks exactly like the 2:1 ratio from the original post but stretched slightly.

Out of curiosity, what language/framework/library are you using here? Maybe someone knows of some specific oddity in what you're working with.

Thanks guys.

I am using C++ with no libraries.

My camera class: